Product Overview
The M5100A767ADRU20-6 is a representative model of the American PERMCO M5100 series high-performance hydraulic gear pumps/motors. PERMCO is a globally leading manufacturer of high-pressure hydraulic gear pumps, gear motors, and flow dividers, renowned for high reliability and high durability.
The M5100A767ADRU20-6 belongs to the M5100 series, featuring a displacement of approximately 83.6 cc/rev (5.1 in³/rev) , a rated working pressure of 25 MPa (approx. 250 bar) , and a maximum peak pressure of up to 28 MPa (approx. 280 bar) . The pump features a high-strength cast iron housing, providing excellent impact resistance and contamination resistance, making it particularly suitable for harsh working conditions such as construction machinery. This model can be used as either a gear pump or a gear motor.
Engineered as a direct OEM-replacement solution for PERMCO original products, the M5100A767ADRU20-6 fully complies with PERMCO original design standards and SAE mounting interface specifications, offering 100% direct interchangeability. Every unit undergoes 100% workload simulation testing prior to shipment, rigorously validating pressure retention, volumetric efficiency, and internal leakage performance to meet or exceed OEM standards.
Model Code Breakdown (Bulleted List) :
M5100 — Series: PERMCO M5100 Hydraulic Gear Pump/Motor
A767 — Design code: Shaft type (A-type key shaft), seal material, etc.
ADRU — Configuration code: Seal and bearing configuration
20 — Port size code: Corresponding to SAE flange or port size
6 — Mounting code: Flange type
Technical Specifications
Model: M5100A767ADRU20-6
Brand: PERMCO (USA)
Series: M5100 Cast Iron Gear Pump/Motor
Theoretical Displacement: Approx. 83.6 cc/rev (5.1 in³/rev)
Rated Working Pressure: 25 MPa (approx. 250 bar)
Peak Pressure: Up to 28 MPa (approx. 280 bar)
Speed Range: 100 – 3000 RPM (depending on load and pressure)
Torque Output (@2000 PSI): Approx. 100 – 150 lb·ft
Operating Temperature Range: 30 – 90℃
Housing Material: High-strength cast iron
Mounting Type: SAE standard flange mounting
Recommended Media: Hydraulic oil
Application Scope: Construction machinery, building machinery, hoisting machinery, mining machinery, etc.
Key Technical Advantages
1. High-Strength Cast Iron Housing – Durable & Impact Resistant
The M5100 series features a high-strength cast iron housing with excellent impact resistance and contamination resistance. Compared to aluminum housings, cast iron provides superior fatigue strength and impact resistance, making it particularly suitable for construction machinery operating under harsh conditions over extended periods. The housing surface is produced using special dry assembly processes and a clean assembly environment to ensure internal cleanliness.
2. High-Pressure Capability – 28MPa Peak
Rated working pressure of 25 MPa (approx. 250 bar) , with continuous operating pressure up to 28 MPa (approx. 280 bar) . Optimized side plate structure and special surface treatment provide excellent pressure resistance and wear resistance.
3. Efficient Side Plate Compensation Structure
The optimized side plate structure and special surface treatment effectively reduce internal leakage and improve volumetric efficiency. The carefully designed internal bearings and sealing elements ensure reliable performance.
4. Low Noise & Compact Design
The product features low noise and a compact, aesthetically pleasing design. Optimized gear design and precision machining effectively reduce operating noise and improve operator working conditions.
5. SAE Standard Interface – Easy Installation
All external connections utilize “SAE” standards, making selection, installation, and replacement convenient. Multiple connection types compliant with SAE standards are available. Configurable as single pumps or multi-section pumps.
6. 100% Factory Tested & Direct Interchangeability
Every unit undergoes 100% workload simulation testing prior to shipment, covering pressure retention verification, internal leakage detection, and flow validation. Fully compliant with PERMCO original design standards, with flange dimensions, shaft specifications, and mounting interfaces identical to OEM pumps—direct drop-in replacement with zero modifications required.
Application Areas
The M5100A767ADRU20-6 gear pump is widely used in the hydraulic systems of the following equipment:
Construction Machinery: Small excavators, loaders, etc.
Building Machinery: Construction equipment hydraulic systems
Hoisting Machinery: Lifting equipment hydraulic systems
Mining Machinery: Mining equipment hydraulic systems
Agricultural Machinery: Harvesters, sprayers, and agricultural equipment
Industrial Equipment: Conveyor belts, mixers, etc.
Drilling Machinery: Drilling rig hydraulic systems
Marine Machinery: Marine hydraulic systems
Expert Maintenance Tips
1. Model Confirmation
The M5100A767ADRU20-6 offers approximately 83.6 cc/rev (5.1 in³/rev) displacement. The M5100 series covers displacements from 33.1 to 198.8 cc/rev. Before installation, confirm the correct displacement based on system flow requirements and verify the complete model code on the pump nameplate. Note that this model can be used as either a pump or a motor—confirm the application type.
2. Rotation Direction Confirmation
Before installation, always verify that the PTO rotation direction of the host machine matches the pump’s rotation direction—incorrect rotation will result in pump failure to prime and may cause severe damage to gears and bearings within a short period.
3. Installation Precautions
Thoroughly clean the SAE standard mounting flange and shaft mating surfaces before installation to ensure no debris remains
Mounting type is SAE standard flange mounting
Use PERMCO-specified torque values for mounting bolts—avoid over-tightening which may cause distortion of the cast iron housing
Ensure correct connection of inlet and outlet ports—the inlet line must have no restrictions or sharp bends
Clean the inside of piping with high-pressure oil before installation to prevent hard particles from entering
4. First Start-Up and Bleeding
Before first start-up, must fill the pump with hydraulic oil through the inlet port—never start dry
After start-up, run at low speed with no load for 2–3 minutes to ensure complete air evacuation from the system
Check for abnormal noise or leakage
5. Fluid and Filtration
Recommended fluids: ISO VG 46 or 68 anti-wear hydraulic oil
Viscosity range: 9 – 2000 cSt, recommended viscosity: 20 – 50 cSt
Operating temperature range: -20 – 70℃
Maintain system oil cleanliness to ISO 4406 18/15 or better
Regularly replace return line filters to prevent contaminants from entering the pump
6. Periodic Maintenance
Check mounting bolt torque every 1,000 operating hours
Regularly monitor system operating pressure—not to exceed 25 MPa rated pressure (28 MPa peak)
Regularly inspect shaft seals to prevent leakage
If flow output decreases, noise levels increase abnormally, or system temperature rises excessively, inspect and replace worn components promptly
